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Related Concept Videos

Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Related Experiment Video

Updated: Jun 16, 2026

RBDT: A Computerized Task System based in Transposition for the Continuous Analysis of Relational Behavior Dynamics in Humans
11:09

RBDT: A Computerized Task System based in Transposition for the Continuous Analysis of Relational Behavior Dynamics in Humans

Published on: July 17, 2021

Are transposition effects specific to letters?

Javier García-Orza1, Manuel Perea, Samara Muñoz

  • 1Departamento de Psicología Básica, Facultad de Psicología, Universidad de Málaga, Málaga, Spain. jgorza@uma.es

Quarterly Journal of Experimental Psychology (2006)
|February 2, 2010
PubMed
Summary
This summary is machine-generated.

Transposing letters in words creates similar-sounding pseudowords. This perceptual similarity extends to digits and symbols, but not pseudoletters, suggesting familiar object locations are understood as distributions.

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Area of Science:

  • Cognitive Psychology
  • Perceptual Science
  • Psycholinguistics

Background:

  • Transposed-letter pseudowords (e.g., jugde-judge) are perceptually similar to base words.
  • The overlap model attributes this to noisy object localization.

Purpose of the Study:

  • Investigate if transposition effects occur beyond letter strings.
  • Examine perception of transposed digits, symbols, and pseudoletters.

Main Methods:

  • Five masked priming experiments were conducted.
  • A same-different task was employed to assess perceptual similarity.
  • Stimuli included transposed letters, digits, symbols, and pseudoletters.

Main Results:

  • Robust transposition effects were observed for letters, digits, and symbols.
  • No significant transposition effect was found for pseudoletters.
  • This indicates a difference in processing familiar vs. unfamiliar objects.

Conclusions:

  • The perceptual similarity effect from transpositions is not limited to letters.
  • Familiar object locations (letters, digits, symbols) are processed as distributions.
  • Pseudoletters may be processed differently due to lack of familiarity.